Sillay is a mix of words silly and slay, it means exactly what it says. It´s silly (foolish) and it slays (as a form of approval). Usually used as an adjective or a verb.
person 1: I think it would be a time saver if cereal came already in a bowl.
person 2: That is so st.. actually sillay.
Short-hand for the word floccinaucinihilipilification, meaning the estimation of something as valueless (encountered mainly as an example of one of the longest words in the English language).
Precedes or follows either a gratuitously disrespectful or honest remark, originated in New York City. Used in similar fashion to "no offense" or "to be honest," interchangeably.
Ya mans is wild buns, respectfully. Respectfully he's washed.
After school, The Modells on Jamaica Ave was active. Respectfully.